Mortal Kombat Tournament Edition M

Noob Saibot - beat Tag Team mode with a team of Noob Saibot and Scorpion
Sektor - beat Tag Team mode with a team of Sektor and Cyrax
Shang Tsung - beat Tag Team mode with a team of Shang Tsung and Quan Chi
Quan Chi - beat Tag Team mode with a team of Quan Chi and Sareena
Bo' Rai Cho - Win Tag Team Mode with every character (except Noob Saibot & Sektor). The game considers Tag Mode beaten by a character as long as they were part of the winning team. You can check the detailed per-character stats by hitting the L-Button on the profile stats page and see if they've beaten arcade & tag modes.
Scorpion - Defeat 10 opponents in Survival Mode with Scorpion
Johnny Cage - Purchase in the Krypt
Raiden - Defeat 10 opponents in Survival Mode with Raiden
Sareena - Purchase in the Krypt
Nitara - Purchase in the Krypt
Mavado - Purchase in the Krypt
Hsu Hao - Purchase in the Krypt
Reptile - Purchase in the Krypt
Cyrax - Defeat 10 opponents in Survival Mode with Cyrax
Drahmin - Purchase in the Krypt

Hsu Hao - Beat 1P Arcade Mode on Normal+ difficulty
Reptile - Beat 1P Arcade Mode with every character (except for Sektor and Noob Saibot) on Normal+ difficulty
Drahmin - Beat 1P Tag Team mode on Normal+ difficulty with any team
Sektor - successfully link to MK:DA
Noob Saibot - First you must have beaten both 1P Arcade (Normal+ difficulty) and Tag Team modes with every other character (except Sektor). The game considers Tag Mode beaten by a character as long as they were part of the winning team. You can check the detailed per-character stats by hitting the L-Button on the profile stats page and see if they've beaten arcade & tag modes. Then you must beat 1P Arcade mode on Hard+ difficulty with Scorpion while using his "Reaper Scorpion" palette.